President Barack Obama gestures after arriving at San Francisco International Airport in San Francisco, Monday, Oct. 8, 2012. The President is spending the night in San Francisco campaigning and fundraising. (AP Photo/Eric Risberg) less

President Barack Obama gestures after arriving at San Francisco International Airport in San Francisco, Monday, Oct. 8, 2012. The President is spending the night in San Francisco campaigning and fundraising. ... more

Photo: Eric Risberg, Associated Press

President Barack Obama gestures after arriving at San Francisco... Photo-3563898.57517 - NewsTimes

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President Barack Obama is greeted by a boy in the crowd after arriving at San Francisco International Airport in San Francisco, Monday, Oct. 8, 2012. The President is spending the night in San Francisco campaigning and fundraising. (AP Photo/Eric Risberg) less

President Barack Obama is greeted by a boy in the crowd after arriving at San Francisco International Airport in San Francisco, Monday, Oct. 8, 2012. The President is spending the night in San Francisco ... more

Photo: Eric Risberg, Associated Press

President Barack Obama is greeted by a boy in the crowd after... Photo-3563899.57517 - NewsTimes

War protesters stand with an effigy of President Barack Obama as supporters of the President wait in line to attend a campaign event in San Francisco on Monday, Oct. 8, 2012. (AP Photo/Mathew Sumner)

War protesters stand with an effigy of President Barack Obama as supporters of the President wait in line to attend a campaign event in San Francisco on Monday, Oct. 8, 2012. (AP Photo/Mathew Sumner)

Photo: Mathew Sumner, Associated Press

War protesters stand with an effigy of President Barack Obama as... Photo-3563901.57517 - NewsTimes

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Taboola Gallery Frame Item-85307.57517 - NewsTimes

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Supporters take pictures of President Barack Obama as he announces the establishment of the Cesar E. Chavez National Monument, Monday, Oct. 8, 2012, in Keene, Calif. The property is recognized worldwide for its historic link to civil rights icon Cesar Chavez and the farm worker movement. (AP Photo/Mark J. Terrill) less

Supporters take pictures of President Barack Obama as he announces the establishment of the Cesar E. Chavez National Monument, Monday, Oct. 8, 2012, in Keene, Calif. The property is recognized worldwide for its ... more

Photo: Mark J. Terrill, Associated Press

Supporters take pictures of President Barack Obama as he announces... Photo-3563902.57517 - NewsTimes

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Hilda Robinson, of Oakland, waits for Obama to arrive for a fundraiser at the Bill Graham Civic Auditorium on Monday Oct. 10, 2012 in San Francisco, Calif.

Hilda Robinson, of Oakland, waits for Obama to arrive for a fundraiser at the Bill Graham Civic Auditorium on Monday Oct. 10, 2012 in San Francisco, Calif.

Romney supporter, Fran Cavenaugh, of Walnut Creeks, tries to send a message to Obama supporters at they wait for the president to arrive for a fundraiser at the Bill Graham Civic Auditorium on Monday Oct. 10, 2012 in San Francisco, Calif. less

Romney supporter, Fran Cavenaugh, of Walnut Creeks, tries to send a message to Obama supporters at they wait for the president to arrive for a fundraiser at the Bill Graham Civic Auditorium on Monday Oct. 10, ... more